Odontaspis speyeri Dartevelle and Casier, 1943

Adolfssen, Jan S. & Ward, David J., 2015, Neoselachians from the Danian (early Paleocene) of Denmark, Acta Palaeontologica Polonica 60 (2), pp. 313-338 : 329

Odontaspis speyeri Dartevelle and Casier, 1943

Figs. 6I , 7A, B .

1943 Odontaspis speyeri sp. nov.; Dartevelle and Casier 1943: 146, pl. 4: 1–13.

See Siverson (1995: 7), for additional synonomy.

Material.—Three teeth ( OESM- 10046-7, OESM- 10046-8, OESM- 10046-10) and several others in a private collection, all from the Br 2 in Faxe.

Description.—Elongated teeth with a prominent main cusp flanked by one to two pairs of small hook-shaped cusplets. The main cusp is very elongated and strongly convex on both the labial and lingual face. The faces are smooth, with no signs of ornamentation. The first pair of cusplets are larger than the second pair and both pairs are connected with the main cusp. The crown-root boundary appears in general to be smooth with only some bulking in anterior teeth. The cutting edge reaches the base of the crown and connects with the cusplets. The roots are bilobed and have elongate and tapered extremities. The basal face of the root is flat and the root has a well-developed lingual protuberance.

Remarks.— O. speyeri has been described from West Africa ( Dartevelle and Casier 1943) and Morocco ( Arambourg 1952) and is characterized by its smooth faces and small twisted lateral cusplets. The teeth collected at Faxe are very close to the size and morphology of the specimens depicted by Arambourg (1952).

Stratigraphic and geographic range.— Odontaspis speyeri appears to have had a fairly wide distribution as it is known from West Africa ( Dartevelle and Casier 1943), Morocco ( Arambourg 1952; Cappetta 1987) and in Scandinavia during the Paleocene ( Siverson 1995).

Figures

Fig. 6. Lamniformes from the Danian of Stevns Kridtbrud, Karlstrup kalkgrav, and Faxe kalkbrud. A–C. Carcharias aff. gracilis (Davis, 1890). A. MGUH 29852 (Ce) anterior tooth in labial view. B. MGUH 29853 (Ce) anterior tooth in labial (B) and lingual (B) views. C. MGUH 29854 (Ce) anterior tooth in 1 2 labial (C) and lingual (C) views. D–H. Striatolamia cederstroemi Siverson, 1995. D. OESM-10046-5 (Br2) anterior tooth in labial (D) and lingual (D) 1 2 1 2 views. E. OESM-10046-6 (Br2) anterior tooth in labial (E) and lingual (E) views. F. OESM-10046-18 (Br2) anterior tooth in lateral (F), labial (F), and 1 2 1 2 lingual (F) views. G. OESM-10046-12 (Br2) lateral tooth in labial (G) and lingual (G) views. H. OESM-10046-11 (Br2) lateral tooth in labial (H) and 3 1 2 1 lingual (H) views. I. Odontaspis speyeri Dartevelle and Casier, 1943, OESM-10046-8 (Br2) anterior tooth in labial (I) and lingual (I) views. J–L. Palae2 1 2 ohypotodus aff. bronni (Agassiz, 1843). J. MGUH 29855 (Ce) anterior tooth in labial (J), basal (J), and lateral (J) views. K. MGUH 298457 (Br1) lower 1 2 3 anterior tooth in labial (K ), lingual (K ) views. L. MGUH 29856 (Ce) posterior tooth in labial (L ) and lingual (L ) views.

Fig. 7. Lamniformes from the Danian of Stevns Kridtbrud and Faxe kalkbrud. A, B. Odontaspis speyeri Dartevelle and Casier, 1943. A. OESM-10046-7 Br2) anterior tooth in labial (A1), lingual (A2), and lateral (A3) views. B. OESM-10046-10 (Br2) lower lateral tooth in labial (B1) and lingual (B2) views. C–I. Cretalamna appendiculata (Agassiz, 1843). C. MGUH1408 (Br2) anterior tooth in labial (C1) and lingual (C2) views. D. MGUH 29858 (Ce) anterior tooth in labial (D1), lingual (D2), and lateral (D3) views. E. OESM-10046-3 (Br2) anterior tooth in labial (E1), lingual (E2), and lateral (E3) views. F. MGUH 29859 (Br2) lower lateral tooth in labial view. G. OESM-10046-2 (Br2) upper lateral tooth in labial (G1), lingual (G2), and distal (G3) views. H. MGUH 29860 (Br2) lower lateral tooth in labial (H1), lingual (H2), and distal (H3) views. I. OESM-10046-4 (Br2) upper posterior tooth in labial (I1), lingual (I2), and distal (I3) views.